Cooling pipe for use in satellite coolers of rotary kilns

ABSTRACT

The lifting blades or vanes on the interior of a cooling pipe of a satellite cooler are connected to the outer wall of the cooling pipe through the provision of blade feet which extend through metal lined recesses in the fireproof inner wall of the cooler, each foot having a pair of hollow portions with a common wall which includes an aperture aligned with an aperture in the outer pipe wall to receive a fastening bolt. The blade foot includes a flange for covering the recess and the connection of the blade foot with the outer wall of the cooling pipe prevents damage to the inner lining during cooler operation and during blade changing operations and provides for an easier disassembly and reassembly during blade changing operations.

[ Mar. 4, 1975 United States Patent 1191 Deussner 5/1942 France 432/1181 COOLING PIPE FOR USE IN SATELLITE COOLERS OF ROTARY KILNS PrimaryEraminer-John J. Camby Attorney, Agent, or Firm-Hill, Gross, Simpson,Van Santen, Steadman, Chiara & Simpson ABSTRACT [22] Filed: Feb. 13,1974 P N04 442,085 The lifting blades or vanes on the interior of acooling pipe of a satellite cooler are connected to the outer [30]Foreign Application priority Data wall of the cooling pipe through theprovision of blade Feb. 14, 1973 feet which extend through metal linedrecesses in the 2307108 fireproof inner wall of the cooler, each foothaving a pair of hollow portions with a common wall which includes anaperture aligned with an aperture in the outer pipe wall to receive afastening bolt. The blade foot includes a flange for covering the recessand the 8 5 1.41% w 3 6 4N0 7F R I no 00 ml W N 1 5 2 u/ 1. "2 m 2 u" 3u" 4 mm mm. 0C r ""3 U M C mk UIF .111 2 8 555 lll connection of theblade foot with the outer wall of the [56] References Cited cooling pipeprevents damage to the inner lining dur- UNlTED STATES PATENTS ingcooler operation and during blade changing operations and provides foran easier disassembly and reassembly during blade changing operations.

9 Claims 2 Drawing Figures COOLING PIPE FOR USEIN SATELLITE COOLERS OFROTARY KILNS BACKGROUND OF THE INVENTION 1. Field of the Invention Thisinvention relates to a cooling pipe, particularly for a satellite cooleron a rotary kiln, and is more particularly concerned with the preventionof damage to the fireproof inner lining and the connection of liftingblades or vanes about the inner wall of such coolers.

2. Description of the Prior Art In cooling pipes known in the prior art,particularly those used for satellite coolers, the lifting blades orvanes are fixed on supporting bodies which are rigidly connected withthe pipe sleeve. These supporting bodies are so dimensioned, withrespect to their height, that they form one surface with the innerlining of the cooling pipe. Furthermore, these known supporting bodiesare tightly embedded in the inner lining of the cooling pipe, the liningbeing introduced only after fixation of the supporting bodies with thecooling pipe sleeve.

As the lifting blades in cooling pipes, particularly the lifting bladesor vanes in cooling pipes for satellite coolers, are subjected both tohigh thermal stresses and to abrasive stresses by means of the materialto be cooled, the wear on the lifting blades or vanes is relativelygreat. The lifting blades or vanes have therefore, only a relativelyshort life and must frequently be exchanged or renewed, respectively.The exchange of worn lifting blades or vanes, is, however, with theseknown constructions, and the fastening in the interior of the coolingpipe, connected with appreciable expenditures of time and money. Also,upon disassembly of the lifting blades or vanes which have becomeunusable, it is often found that the inner lining is frequently damagedor disturbed in the area of the fastening of the lifting blade or vane.In addition, in this known type of lifting blade fastening in coolingpipes, relative movements between the supporting bodies and the innerlining, which may lead to damage of the inner lining in the area offastening of the lifting bodies or vanes during operation of theapparatus has not been prevented.

SUMMARY OF THE INVENTION The object ofthe present invention resides inthe provision of a cooling pipe in which the disadvantages indicatedabove are prevented and the inner lining is protected, in the area offastening of the lifting blades or vanes, from distortion and damage.

Attendant to this object is the provision of a longer cooling pipe lifeand an appreciable simplification of the mounting and dismounting oflifting blades or vanes during replacement of the same.

These objects are achieved in that the inner lining of a cooling pipe,in the area of the fastening of the lifting blades or vanes includes arecess which extends to the wall of the cooling pipe, through whichrecess at least one fastening foot of a blade or vane is disposed. Thefastening foot is thereby connected to the outer wall of the coolingpipe so that in the area of the fastening of the lifting blade or vanewith the pipe wall, the inner lining is not stressed, because of therecess, and the lifting blade or vane may be quickly exchanged andrenewed in a simple manner, without thereby experiencing damage ordistortion.

Furthermore, through the measures provided by the present invention,fastening of the lifting blade or vane through the recess in the innerlining provides a direct connection with the pipe wall, so that evenwith elastic deformations of the fastening of the blade or vane, or ofthe pipe sleeve, in the area of the fastening, does not result indamage, distortion or disturbance of the inner lining. As a veryadvantageous result, therefore, the deformations of the foot of alifting blade or vane and of the pipe wall occurring through the effectsof heat are taken into account to a fargoing extent and thereby the lifeof these elements and of the cooling pipe is increased.

In an advantageous development of the invention, the recess in the innerlining is lined with a metal sleeve. In this manner, the inner liningmay be introduced or applied before the fastening of the lifting bladesor vanes to. the pipe wall, which leads to an appreciable simplificationand facilitation of the lining work or operation. In addition, by meansof the metal sleeve in the recess, also the inner lining in this area isreliably insured with respect to damage or disturbance, both duringoperation as well as during dismounting of old and the mounting of newlifting blades or vanes.

In accordance with a further advantageous construction of the invention,the fastening foot of the lifting blade or vane is constructed to be:substantially hollow. This hollow construction of the fastening footprovides a decrease in material costs, as well as a simplification ofthe mounting and dismounting of the lifting blade or vane.

According to a further advantageous construction for the fastening ofthe foot of a lifting blade with the wall of the cooling pipe, aclamping bolt with a relatively long shaft is provided, the head of thebolt engaging the fastening foot at a distance spaced from the pipewall. Therefore, the clamping bolt and spacing very advantageouslyprovides an accommodation for the expansion and bending strainsoccurring during operation, wherein'these strains are transferred to therelatively long or elongate construction of the shaft of the bolt, ortaken up by the shaft so that breaks between the head of the bolt andthe shaft are prevented.

In order to protect the recess in the inner lining, particularly forprotecting the edge of the, recess at the inner surface of the innerlining, in an advantageous further development of the invention, thefastening foot is provided with a flange which covers the recess of theinner lining.

According to a further and particularly suitable construction of theinvention, the lifting blade or vane is provided on its front sideand/or on its rear side with at least one projection which extendsbeyond the lifting blade surface. Very advantageously, a part of thematerial taken up by the lifting blade or vane is held back ordischarged with a delay because of these projections which provides fora very favorable and uniform distribution of the material in the streamof gas conveyed through the cooling pipe and contributes to a greatdecrease in the wear of the lifting blade. The life of the lifting blademay therefore be substantially increased through the provision of suchprojections.

In a further development of the invention, at least one reinforcementrib is arranged on the rear side of the lifting blade. By means of sucha reinforcement rib on the rear side of the lifting blade the strengthof the lifting blade or vane is very advantageously substantiallyincreased.

BRIEF DESCRIPTION OF THE DRAWING Other objects, features and advantagesof the invention, its organization, construction and operation will bebest understood from the following detailed description of a preferredembodiment of the invention, taken in conjunction with the accompanyingdrawing, on which:

FIG. 1 is a sectional view of a portion of a cooling pipe taken througha lifting blade having a fastening foot which is fixed to the pipe wallwithin a recess in the inner lining according to the invention; and

FIG. 2 is a sectional view taken generally along the line IIII of FIG.1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a wall 1ofa cooling pipe, for example a satellite cooler on a rotary kiln, isprovided with a fireproof inner lining 2. The inner lining 2 is providedwith recesses 3 (only one shown) which extend to the pipe wall 1 andwhich receive a fastening foot 5 carried by a lifting blade 4.

The fastening foot 5 extends through the recess 3 up to the pipe wall 1,a metal plate 11 as will be discussed below being disposed intermediatethe foot 5 and the wall I.

The recess 3 is lined with a metal sleeve 6 and, as illustrated in FIG.2, has a cross section, for example, in the shape of a rectangle.

The fastening foot 5 of the lifting blade 4 is constructed with inwardlyextending walls so as to be essentially hollow. More specifically, thefastening foot 5 includes a pair of interiorly extending oppositelydirected truncated cone-shaped hollow chambers 7 and 8, respectively,with a common wall 16. The bottom part of the fastening foot 5 (asviewed in the drawing) which forms the two hollow chambers 7 and 8 is soarranged in the blade foot that a space is provided between the commonwall 16 and the outer wall 1. The common wall is provided with anaperture 9 which receives the head 17 of a relatively long shanked bolt10 which, with a washer 18 and a nut 19 serves for fastening the foot 5of the lifting blade 4 to the wall 1 of the cooling pipe.

The fastening foot 5 of the lifting blade 4 is disposed within therecess 3 on a metal plate 11 having an aperture therein for receivingthe shank of the bolt 10.

The fastening foot 5 of the lifting blade 4 is also provided with aflange 12 which covers and protects the edge of the lining 2 whichdefines the recess 3 from damage.

The lifting blade 4 is provided, on its front side and on its rear side,with a plurality of projections 13 and 14 which extend beyond theirrespective blade surfaces and which are arranged to extend somewhat inthe axial direction of the cooling pipe. Furthermore, the lifting blade4 has, on its rear side, a reinforcing rib 15 extending in thelongitudinal direction of the blade.

Due to the fact that according to the invention the inner lining 2 has arecess 3 extending to the pipe wall, through which the fastening foot 5of the lifting blade 4 passes and is fixedly connected to the pipesleeve with the aid of a tightening screw or clamping bolt 10, a liftingblade which has become unusable may be disconnected very simply andquickly and replaced by a new lifting blade without damage or distortionbeing inflicted to the inner lining 2 in the area of the lifting bladefastening. In addition to this, very advantageously the relativemovements positively occurring during operation between the foot 5 ofthe lifting blade 4 and the inner lining may be assumed or equalized bythe bolt 10 and not transferred to the inner lining 2, so that duringoperation, even at quite high thermal and mechanical stresses, orstrains, on the lifting blades, damage of the inner lining 2 in the areaof the lifting blade fastening does not occur.

The metal plate 11 arranged between the fastening foot 5 of the liftingblade 4 and the pipe wall 1 very advantageously protects the wall 1 inthis area from excessive strain or damage. Furthermore, through thehollow construction of the fastening foot 5 shown in FIG. 1, there veryadvantageously occurs a saving in material and the clamping bolt headreceived in the aperture 9 of the foot 5 is to a fargoing extentprotected from thermal and abrasive influences. The head of the clampingbolt 10, may, in this hollow construction of the fastening foot 5 of thelifting blade 4, further and also very advantageously be protected fromdisadvantageous thermal and mechanical strains through filling of thehollow chamber 7 with a fireproof ramming or stamping mass. The life ofthe clamping bolt 10 is appreciably extended in this manner. Inaddition, the life of the lifting blade 4 may be appreciably increased,according to the invention, through the provision of the projections 13and 14 which extend beyond the surfaces of the front side and rear sideof the blade. From the material filling lying in the pipe, or from thematerial trickling down from the blades located in the upper area ofrotation, cushions of material are collected beyond a certain angle ofrotationbetween the projections 13 and 14, which cushions protect thelifting blade body 4 from wear. Furthermore, also the reinforcing rib 15extending the length of the blade 4 on the rear side thereof contributesto the reinforcement and simultaneous lessening of wear of the liftingblade 4.

The recess in the inner lining of the cooling pipe according to theinvention, as well as the construction and fastening of the liftingblade with the cooling wall is not limited to the embodiment shown byway of example in FIGS. 1 and 2. Thus, for example, the fastening foot 5of the blade 4 may be constructed in other cross sections in addition tothe rectangular cross section shown, for example in a cylindrical shapeor the like. Also, the lifting blades, each according to size may beequipped with two or more fastening feet, without departing from theinvention.

In the foregoing I have described a preferred and alternateconstructions of my invention. Many changes and modifications, otherthan those set forth above, may become apparent to those skilled in theart without departing from the spirit and scope of my invention. Itherefore intend to include within the patent warranted hereon all suchchanges and modifications as may reasonably and properly be includedwithin the scope of my contribution to the art.

I claim:

1. A cooling pipe for a satellite cooler on a rotary kiln, comprising:

a pipe wall,

an inner wall having a fireproof lining,

a material lifting blade arranged on the inner wall,

a recess in said inner wall for said lifting blade, said recessextending to said pipe wall, a metal sleeve lining said recess, a metalplate between said sleeve and said pipe wall, an aperture in said pipewall, a fastening foot on said blade, and a fastening device extendingthrough said aperture to fasten said foot to said pipe wall. 2. Acooling pipe according to claim 1, wherein said fastening foot comprisesa laterally extending flange disposed to cover said recess when saidlifting blade is within said recess. 3. A cooling pipe according toclaim 1, wherein said blade includes a reinforcing rib extendingtherefrom.

4. A cooling pipe for a satellite cooler on a rotary kiln, comprising:

a pipe wall, an inner wall having a fireproof lining, a material liftingblade arranged on the inner wall, a recess in said inner wall for saidlifting blade, said recess extending to said pipe wall, an aperture insaid pipe wall, a fastening foot on said blade, said fastening footincluding a first hollow portion, a second hollow portion, a common wallbetween said first and second hollow portions, and an aperture in saidcommon wall, and a fastening device to fasten said foot to said pipewall, said fastening device including a bolt extending through saidcommon wall aperture and said pipe wall aperture, said bolt including ahead adjacent one of said apertures,

a threaded portion, and

a nut threadedly engaging said threaded portion adjacent the otheraperture to clamp said foot to said pipe wall.

5. A cooling pipe according to claim 4, comprising a metal sleeve liningsaid recess,

a metal plate between said sleeve and said cooling pipe wall, and

an aperture in said metal plate aligned with said common wall and pipewall apertures and receiving said bolt therethrough.

6. A cooling pipe according to claim 1, wherein said lifting bladecomprises a least one projection extending from and beyond a surface ofsaid blade to delay and provide a uniform discharge of material.

7. A cooling pipe according to claim 6, wherein said projection extendsapproximately in the axial direction of said pipe.

8. A cooling pipe according to claim 1 wherein said foot has arectangular cross section as viewed perpendicular to said pipe wall.

9. A cooling pipe according to claim 8, wherein said foot has anX-shaped cross section as viewed in a direction of said pipe wall.

1. A cooling pipe for a satellite cooler on a rotary kiln, comprising: apipe wall, an inner wall having a fireproof lining, a material liftingblade arranged on the inner wall, a recess in said inner wall for saidlifting blade, said recess extending to said pipe wall, a metal sleevelining said recess, a metal plate between said sleeve and said pipewall, an aperture in said pipe wall, a fastening foot on said blade, anda fastening device extending through said aperture to fasten said footto said pipe wall.
 2. A cooling pipe according to claim 1, wherein saidfastening foot comprises a laterally extending flange disposed to coversaid recess when said lifting blade is within said recess.
 3. A coolingpipe according to claim 1, wherein said blade includes a reinforcing ribextending therefrom.
 4. A cooling pipe for a satellite cooler on arotary kiln, comprising: a pipe wall, an inner wall having a fireprooflining, a material lifting blade arranged on the inner wall, a recess insaid inner wall for said lifting blade, said recess extending to saidpipe wall, an aperture in said pipe wall, a fastening foot on saidblade, said fastening foot including a first hollow portion, a secondhollow portion, a common wall between said first and second hollowportions, and an aperture in said common wall, and a fastening device tofasten said foot to said pipe wall, said fastening device including abolt extending throUgh said common wall aperture and said pipe wallaperture, said bolt including a head adjacent one of said apertures, athreaded portion, and a nut threadedly engaging said threaded portionadjacent the other aperture to clamp said foot to said pipe wall.
 5. Acooling pipe according to claim 4, comprising a metal sleeve lining saidrecess, a metal plate between said sleeve and said cooling pipe wall,and an aperture in said metal plate aligned with said common wall andpipe wall apertures and receiving said bolt therethrough.
 6. A coolingpipe according to claim 1, wherein said lifting blade comprises a leastone projection extending from and beyond a surface of said blade todelay and provide a uniform discharge of material.
 7. A cooling pipeaccording to claim 6, wherein said projection extends approximately inthe axial direction of said pipe.
 8. A cooling pipe according to claim 1wherein said foot has a rectangular cross section as viewedperpendicular to said pipe wall.
 9. A cooling pipe according to claim 8,wherein said foot has an X-shaped cross section as viewed in a directionof said pipe wall.